# A thermodynamic distance criterion of optimality for the calculation of free energy changes from computer simulations

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AbstractOn the basis of the experimental Gibbs free-energy barrier of the degenerate Cope arrangement in semibullvalene, B3P86 shows the best agreement, while B3LYP and MP2 underestimate and CCSD(T) overestimates the barrier. The substituent effect proposal by Hoffmann has been verified. In...